Annual · Campanulaceae family
Edging lobelia
Lobelia erinus
In short a 10-second read
Edging lobelia (annual) grows to 0.15–0.25 m tall and 0.15–0.3 m wide when mature. It grows best in full sun to part shade, in average to moist soil. It flowers in April–June; the flowers are blue, purple, pink, white or red.
× spread 0.15–0.3 m
Where to plant
Sun and soil.
It grows best in full sun to part shade, in average to moist soil.
Sun
Tolerates several positions — choose to suit the rest of the garden.
Soil and water
average to moist · watering: moderate
Soil: humus-rich, loamy
How much space it takes
Mature size.
The mature plant next to a person (175 cm).
Next to a person
The final size depends on the cultivar and the spot — we give the range from smallest to largest.
Calendar
What to do and when.
Months for Central Europe. The line shows the current month.
The year at a glance
Flowers
April–June · blue, purple, pink, white or red
Planting
sow indoors: February–March
Winter protection
does not overwinter
What to combine it with
Same needs, different flowering.
They share the same sun and soil and flower in other months — so the bed flowers for longer.
Frequently asked
Quick answers.
When does Edging lobelia flower?
In April–June; the flowers are blue, purple, pink, white or red.
Does Edging lobelia tolerate shade?
It tolerates part shade (3–6 hours of sun), but not full shade.
How much space does Edging lobelia need?
At maturity 0.15–0.3 m wide and 0.15–0.25 m tall; recommended spacing 20 cm.
Where the data comes from
We compared the data in 17 expert sources. Last checked 28 September 2026.
Show sources (17)
- GBIF Backbone Taxonomy — Lobelia erinus
- GBIF Occurrence Search API — Lobelia erinus
- GBIF Vernacular Names API — Lobelia erinus
- Wikidata (CC0) — Lobelia erinus
- Missouri Botanical Garden Plant Finder — Lobelia erinus
- NC State Extension Gardener Plant Toolbox — lobelia erinus
- Pladias — Databáza českej flóry a vegetácie
- EPPO Global Database — Lobelia erinus
- RHS - Lobelia erinus
- GrowJoy
- Invasive plant lists — this species is not on them: EASIN, EU, Slovakia, Czechia, Germany, Poland, Denmark
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